Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-31-08, 07:01 PM   #1
robow
Senior Member
Thread Starter
 
robow's Avatar
 
Join Date: Aug 2005
Bikes:
Posts: 2,675
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
6061 vs. 7005 Aluminum tubing

For those in the know, is there any significant difference between 6061 and 7005 aluminum alloy tubing that might create a superior frame for say cyclocross ? Are there many inherent differences ? Thank you for your insights.
robow is offline   Reply With Quote
Old 10-31-08, 07:18 PM   #2
robow
Senior Member
Thread Starter
 
robow's Avatar
 
Join Date: Aug 2005
Bikes:
Posts: 2,675
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
OK, never mind, found a lot of info on other sites.
robow is offline   Reply With Quote
Old 11-08-08, 04:05 PM   #3
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://www.matweb.com
DannoXYZ is offline   Reply With Quote
Old 11-23-08, 10:24 AM   #4
ElJamoquio
Burning Matches.
 
ElJamoquio's Avatar
 
Join Date: Jan 2006
Location: San Jose, CA
Bikes: Motobecane Le Champion SL, Cervelo P2SL
Posts: 9,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 147 Post(s)
7005 has much better (I believe twice) fatigue strength.
__________________
Reacting is mind candy; it requires no thought. Thinking is tedious.

Bikeforums 'Group Buy': Kinlin Rims, Sapim/DT Spokes, Formula/Bitex Hubs


"The only good race pace is suicide pace, and today looks like a good day to die."
-Steve Prefontaine
ElJamoquio is offline   Reply With Quote
Old 12-10-08, 03:18 PM   #5
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Bikes: MTBs, BMX, Pocket MTB
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by robow View Post
OK, never mind, found a lot of info on other sites.
Could you let us know the sites where you got the best info from? Thanks!
Pocko is offline   Reply With Quote
Old 12-10-08, 04:25 PM   #6
Fat Boy
Wheelsuck
 
Fat Boy's Avatar
 
Join Date: Jun 2007
Bikes:
Posts: 6,158
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My books say that 7xxx AL is not suitable for arc or gas welding where as 6xxx series AL is.

Having said that, 7005 is not specifically mentioned. Since some bikes are made out of it, welding properties must not be too bad.

Like ElJam says, it's quite a bit stronger, so you could theoretically build a lighter frame. By playing with tubing sizes, the frame could end up more or less stiff, the 2 do not necessarily go hand in hand.
Fat Boy is offline   Reply With Quote
Old 12-10-08, 05:20 PM   #7
robow
Senior Member
Thread Starter
 
robow's Avatar
 
Join Date: Aug 2005
Bikes:
Posts: 2,675
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
There are bunches more out there

http://www.matukas.pri.ee/KB/alumiin...7005frames.pdf
http://www.bikeforums.net/archive/index.php/t-6981.html
http://www.bikeforums.net/archive/in...p/t-15193.html
robow is offline   Reply With Quote
Old 12-10-08, 07:15 PM   #8
sstorkel
Senior Member
 
Join Date: Apr 2008
Bikes: Cervelo RS, Specialized Stumpjumper FSR Pro, Schwinn Typhoon, Nashbar touring, custom steel MTB
Posts: 5,426
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by Fat Boy View Post
My books say that 7xxx AL is not suitable for arc or gas welding where as 6xxx series AL is.
The chart I have, which I think I grabbed from either Miller or Lincoln, says that you can weld 7005 to 7005 using 5556, 5183, or 5356 filler wire. You can join it to most other weldable aluminum alloys using 5356 filler, though there are some exceptions.
sstorkel is offline   Reply With Quote
Old 12-12-08, 07:48 PM   #9
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Bikes: MTBs, BMX, Pocket MTB
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by robow View Post
For those in the know, is there any significant difference between 6061 and 7005 aluminum alloy tubing that might create a superior frame for say cyclocross ? Are there many inherent differences ? Thank you for your insights.
In layman's terms 7005 is stronger than 6061 (for bicycle frame building applications almost a parallel between chromoly and high tensile steel). The extra strength of 7005 allows for thinner wall thicknesses and therefore a lighter frame. Butted and double butted aluminium tubes are usually 7005 for this reason. Building a 7005 frame with the same tubular wall thicknesses as those utilized for a 6061 frame defeats the purpose as the frame would weigh the same and the advantage is lost. During heat treatment, 7005 is tempered with a sudden blast of cool air, whereas 6061 is dunked in water (I hope I got that one right and not the other way around!)

Now here's what's interesting... in one of my factory visits in China, I asked the very same question. Somewhere along the conversation of heat treatment (and various sushi and beer type comparisons between the west and east), I asked "does the heat treatment or temper (T6) in aluminium last forever?" The answer was a rather casual, no!

Now I'm kicking myself here, because I wasn't really listening (maybe I got distracted by the prospect of eating the turtle soup )... but the temper apparently diminishes in time, like it self-anneals or something. Don't ask me how many years, but just in case you want to bequeath the frame to your grandson or something, it might pay to check this aspect in your research. One of them lasts a heck of lot longer than the other, I'm just not sure which one it is.

Please bear in mind that this is what I've been told and I have not had the time or the need to verify the information. So if you find out, please kindly post back and let us know.

Funny that, suddenly I feel like having some sushi...

.
Pocko is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:16 AM.